Front wall air grid



Maj' 2, 193.3. c E HARRlsoN 1,907,066

FRQNT wrm-AIR GRID Filed oct. 2, 1929 5 sheets-sheet 1 ummm.

May 2, 1933. c. HARRISON 907,066

FRONT WALL AIR GRID Y Filed dat. 2. 1929 s sheets-sheet 2 i Z' Y 23 /zlf /Vrm ZTLUQTLZLff @ggf-tgig? waff/Y l May 2, 1933. c.;Y E. HARRISON 1,907,066

FRQNT WALL AIR GRID File@ Ooi. 2. 1929 5 Sheets-Sheet 3 Patented May 2.- 193g Lentes LIFFORD E. 1:

BISON, F PHILADELPHIA, PENNSYLVANIA, ASSXGNOR T0 .AME{.EtiClAICi4 ENGINEERING COMPANY, 0F PHILALDELPHIA.,` PENNSYLVANIA, A. CORPORATION t or rrsrnvmr FRGNT WALL AIR, GRID Application lefl October 2, 1929. Serial No. 396,751.

This invention relates to furnace wall constructions and more particularly to the construction of the base of a front furnace wall.. l

An important object of the invention is the provision of a structure of this character which provides forl air-cooling of the front wall and at the same time produces a 'flat surface upon which the wail may be built. v

. A further object of the invention isl the production of a construction such that front grid bars associated with the cooled section of the wall are made removable and are so constructed Vthat they may be held in position without the use of bolts or the like and may, accordingly, be readily replaced wheny everthis becomes necessary without disturbing the brick work of the wall.

A. still. further object ofthe invention is to provide an air-cooled extension for the usual ram box `cap which combines with the air boxes of the cooled wall structure to form a seat for the brick work of the wall and is-so formed that'it may be removed and replaced withoutdamage to thebrick work. l

A further object of the invention is the production of a construction of the charac# ter above described which may be practically poduced, which is `readily installed, and which will be durable and eflicient in service.

These and other objects I attain through the construction shown in the accompanying drawings wherein, for the purpose of illustration, I 'have shown a preferred embodi- -ment of m-yinvention and wherein :J

` Fig. 1 is a fragmentaryv perspective of the air-cooled section, parts being broken away Ato show the method of connecting the air boxes andram cap extensions to the normal furnace structure;

Fig. 2 is a vertical sectional view through the air box and its associated removable grid bar structure;

Fig. 3 is a vertical sectional view through the ram cap and its extension;

Fig. 4 is a fragmentary inner face view of a furnace front wall constructed in accord-- ance with my invention; and

F ig. 5 is a section on line 5 5 of Fig.y

Referring now more particularly to the drawings, the numeral generally designatesside plates of a retort and 11 a side plate cap comprising `a plate horizontally disposed and maintained in this position through angular side 'flanges 12 engaging the inclined upper edges of the retort side u plates. This plate has an opening therethrough permitting passage of air from the spaces between the retort side plates and'at its upper surface is formed with a plurality of lugsli co-acting with an air box 111 to maintain the same a ainst-dislodgment upon the upper .surface o? the plate and to maintain an opening 15 formed in the bottom wall 16 of the box in alignment with the opening 17 of the plate. The outer wall of this box is closed as indicated `at 18 while the inner end'thereof opens tothe interior of the furnace. Upon the sidewalls of the box adjacent lthe inner end thereof substantically C shaped flanges 19 formrecesses 20 the inner ends of which are open. rlhese recesses are in communication Withthe interior of the box through an opening or openings as indicated at 21,. lllxtending transversely of the\ box adjacent the inner end thereof and projecting through the side walls into the recesses is a'bar 22,.the purpose of which' will presently appear.

The front edges of th' box are cut away below the upper wall 23 as indicated at 24; so that at the inner end *of the box the inner edge of the side plate cap 11 is exposed for a substantial distance. Gridv bars 25 are provided, each comprising a body of uniform thickness, the side edges e slde walls of th lines in Fig. 2. s l Ram box cap extens1on 33 is in the form under surface, at the sides thereof, is pro-f of which are formed with parallel horizontally extending grooves 26 producing air openings 27 when the bars are in side to side relation. The lower ends of these bars seat upon projecting inner edges of the side plate cap and the upper ends of the bars which are reduced in depth as indicated at 28 abut against the upper wall 23 of the box. This upper wall at its inner edge is thickened at 29 and the upper extremities of the bars engage thereagainst in such manner that the upper faces are spaced below the level of the upper face of the air box upper wall 23.

Projecting inwardly from the inner f ace of each grid bar is a cooling flange 30 whlch, adjacent its upper end, is yprovided with a hook 31 having a downwardly projecting bill adapted to engage against bar 22. Bar 22 is canted so that its inner face 32` inclines inwardly and downwardly with the result that the vbill, of hook 3l engaging thereagainst wedges the grid bar inwardly so that it is firmly held against the inner face of the air box.Y

About the opening 15 the air box is preferably provided at its under surface with an annular packing-receiving groove 15-a for the reception of a ring of packing preventing escape of air between the air box and the side plate cap. The air box is provided in its lower wall 16 with a bolt opening 16-a through which a bolt may be directed for passage through the said plate cap andthe uppermost tuyere T which projects thereunder as indicated iin, dotted of a hollow metallic block having openings 34 through its'. inner end wall 35 and openings 36 through its side walls and at its vided with downwardly projecting flanges 37 adapted to seat upon the edges of adjacent side plate' caps 11. At its front wall the block is provided Ywith hooked extensions 38 adapted to engage through openings, 39,

formed inthe upper surface of the ram box cap 40 and over thefront wall 41 of this cap. It will be noted that the sides of the extensions 331 abut the' outer edges of the flanges 19 and that the openings 36 com-i municate with the recesses 20 formed upon the sides of theair boxes 14'so that air passing from the air boxes through openings 21 may enter vthe ram cap box extension and escape therefrom lthrough openings 34.- In erecting a furnace `wall with a construction of this character, bricks B are placed upon the upper surface f the ram box cap and ram box cap extension t'o fill the space therebetween, crevices being suitably filled with fire cla or some' suitable-substance: The bricks also abut the outer. edges of the flanges 19, the latter functioning to. space clay or some suitable filler of the same charl acter as indicated at 42 is placed between the projecting edge of the wall W and the upper end faces of the grid bars and serves to ei'ectually prevent any verticalf movement of the grid bars. In' the event these lbars become burned or broken and must be replaced this may readily be accomplished by digging out the filling 42and elevating the bars so that the bills of hooks 31 clear the wedge bars 22 when they may bel removed in a horizontal direction. In event that ram box cap extension must be replaced, brick work B is removed which may be accomplished without disturbing the wall W.

As the .structure employed lils vobviously capable of a considerable range of `,change and modification without in any manner de`r parting from the spirit of my invention I accordingly do not vlimit myself to such structure except as hereinafter claimed.

I claim:

' 1. In a`stoker furnace including spaced retorts, a support for the front wal1,there.

s of including ram box caps associated with the retorts and air boxes disposed 'between/ the ram box caps and communicating with the spaces between the reterts, said air boxes each having a plurality of independently removable grid bars at their inner ends, the

rear ends of the air boxes extending rearwardly of the ram box caps and extensions for said ram box caps which are hollow and in communication with the air-boxes, said ram box cap extensions having openings at their reary'ends. A

2.*In 'a stoker furnace including spaced retorts, a support fo,r-thetfrontg'gall thereof including ram caps associated with the retorts and airnboxes disposed between the ram box caps and'vcommunicating' withthe spaces between the retorts, said air boxes each having a plurality of independently removable grid bars at their -nner ends, the, v

rear ends of the air boxes extending' rearwardly of the ram box caps and extensions for said ram box caps which are hollow and in communication with-the air boxes,= said ramY box cap extensions having openings at their rear ends, connections for said caps and their extensions disengageable by vertical movement of said extensions,'remov able means seated upon the caps and theirv Leoaoee extensions filling the space between the air munication with the air boxes, said ram box cap extensions having openings at their rear ends, connections for said caps and their 'extensions disengageable by vertical movement of Said extensions, removable means seated upon the caps and their extensions filling the space between the air boxes and normally preventing removal of the extensions and a wall supported from said rel'movable means and said air boxes.

4. In combination with a Stoker furnace having the usual retortside plates, the upper ends of which in alignment with the retorts "are bridged by 'ram box caps, air boxessupported from said side plates intermediate the ram box caps and having their inner ends open and removable grids at the inner ends of said boxes, said boxes'and the ram box caps forming a support for the front wall of the furnace.

5. A furnace front wall support comprising ram-box caps alternated with air boxes, the air boxes having removable grids at their inner ends, saidair boxes projecting rearwardly beyond the inner ends of the air box:

caps, hollow extensions for said ram box caps having apertures in their inner end Walls and means for delivering air to the `rearwardly beyond the inner ends of the air boxes and to the interior of said exten-4 sions.

. '6. A furnace front wall support comprising ram box caps alternated with air boxes, the air boxes having removable grids at their inner ends, said air boxes projecting air box caps, hollow extensions for said ram l box caps having apertures in their inner end walls and means'for deliverin air to the air` boxes and'to the interior of said exten-f sions through said air boxes.

v 'i'. An 'air box for Stoker furnaces comprising a Vcasing having an inlet opening and an open side, a bar paralleling said side and having the face thereof removed from 'the Wall inclined and grid bars for bridging the said side having hooks the ybil s of which have werlging` engagement with said bar to thereby maintain said bars in engagement with the upper and lower walls of the casing.

8. An air box for stoker furnaces comprising a casing having an air inlet 'and an against the upper and lower walls of the casing, disengageable to permit horizontal removal of the grid bars after a predetermined vertical movement thereof. Y

10. A furnace front wall support comprising ram box caps alternated with air boxes, the air boxes having removable grids at their inner ends, said air boxes projecting rearwardly beyond/the inner ends ofthe air box caps, hollow extensions for said ram box caps having apertures in their inner end Walls and means for delivering air to the. air boxes and said extensions having communication through confronting Walls thereof.

1l'. A Stoker vfurnace comprising alternately arranged inclined retort and tuyre sections, horizontally .arranged plates supported at the upper ends of the said tuyre sections, air boxes mounted on said plates, the plates being apertured to adoi'd communication between the interiors ofthe tuyres e and said boxes, ram box caps bearing upon said plates in positions intermediatel said air boxes and bridgingthe .upper ends of the retorts, and hollow cap extensions also positioned on said plates intermediate the/ air boxes, said extensions and air boxes having apertures through which communication is established-between the interiors of the extensions and the air boxes, and said extensions having 'discharge openings communicating with the space overlying said retorts.

12 ln a 4stolzer furnace, the combination with alternately arranged inclined retort and tuyre sections, of plates horizontally disposed at, the upper ends of the said tuyres, air boxes mounted on said plates, interlocking means for predeterminedly positioning said air boxes on the plates, saidl plates having apertures through which the having discharge open1ngs Acommunicating with. the" space overlying the said retorts/ and tuyres, and ram box'caps mounted intermediatefthe air boxes in *positions bridging the upper ends of the retorts, each of .said/caps comprising a hollow section having apertures communicating with the space overlying the .said retorts and tuyres, and said hollow sections and said air boxes having related apertures through which combridging the upper ends of the retorts, said air boxes and caps being hollow and having apertures through which their interiors communicate, and said plates having apertures through which the interiors of said boxes communicate with the interiors of the tuyres, both the caps and air boxes having discharge ports communicating with the space overlying the said tuyres and retorts.

14. In a Stoker furnace, the combination with alternately arranged inclined retort and jtuyre. sections, of plates secured in horizontal position at the upper ends ofthe, tuyre sections, eachof said plates having an aperture communicating with the inte-- rior of the underlying tuyre, independently formed ram box caps and air boxes mounted above saidA plates, means interloclng the( plates with the said; caps and air boxes whereby the caps 'and air boxes gare' preydeterminedly positioned, said caps/'and air boxes being hollow and having related apertres establishing communication' betweenthe interiors, andI said boxes communicating'with the. tuyres through the said apertures in the plates, both the said caps andV air boxes having discharge openings communicating with the space overlying the retorts and tuyres,

15. In a Stoker furnace,` the combination with an inclined grate structure comprising alternately arranged retort and tuyre secp tions, of a 'plate secured in'horiontal position at the upper end of each of said tuyres, independently formed ,ram caps and ail` boxes supported on' said plates in alternate -arran ment, and means on said platcsinterloc ing both'with the ram caps and with l the air boxes for maintaining said caps and,

boxes in predetermined positions.

16. In a Stoker furnace, the combination with an inclined grate structure comprising alternately arranged retort and tuyre sections, of a plate`` secured in horizontal posi-- tion at .the upper end of each of the tuyres, an air'box mounted` on each of said plates and communicating through the plate with the interior ofthe underlying tuyre, said air box having a rtures communicating with the space over ying the grate, and hollow ram cap elements also supported o'n ,said plate in positions .bridging the upper ends of the retorts and communicating with therinteriors of said air boxes, sald cap elements having discharge openings communieating with the space above the said grate.-

17. A furnace front wall support comprising alternately arranged ram box caps and air boxes, said caps hav-ing, remo fable boxlike inner end portions communicating with the interior of adjoinin boxes and apertured at their inner ven s, and said boxes having at their inner ends removable grids, andy `interlocking means securin the portions of the respective caps toget er.

l 18. In a Stoker furnace including spaced retorts, a support for the front wall thereof including ram box capsassociated with the ,retorts, and air boxes disposed between theram box caps and communicating with the spaceslbetween the retorts, saidcaps havingremovable box-likev inner end portions communicating with the interior of'- adjoiningl boxes and apertured at Itheir inner ends, and said boxes having at their inner .ends removablel grids. v

u19. A furnace front wall support comprising independent l alternately 'arranged ram box caps and air boxesJ said caps comprising inner .box-like portions communicating with the interior of adjoining boxes, and v said boxes and the box-like portions of said' ,caps'being apertured at their inner ends.

/QOIna Stoker furnace including spaced retorts, a support forthe front Wall thereof including ram box caps yassociated with the retorts, andv air boxes disposed between the ram box caps and Acommunicating with the spaces between the retorts, said caps having inner box-like portions communicating with the interior of adjoining boxes, and both the boxes and said box-like portions being apertured at their innerends.v

21. A grid for an air-cooledfurnace. wall comprising a body portion having av surface exposed to the heat of the furnace, said body ortion being substantially uniform in width, the' upper and lower ends thereof .being relatively thick and tapering toward the exposed surface of said body portion so that a substantial portion thereof intermediate said end is relatively thin', a series of parallel grooves provided along' the sides of said body portion, a riange extending rearwardly of said body portion and positioned internfediate the side edges thereof, and a hook provided at the.' rear end of said flange for engaging fixed securing means to retain 4 said grid in proper position.

' 22'. A grid for an air-cooled furnace wall comprising a body portion having a surface vexpiosed to the heat of the furnace, said body lpotion being substantiallyv uniform in width, the upper andlower ends thereof being relativel thick and tapering toward the exposed sur ace of said body portion so that -a substantial portion thereof intermediate said ends is relatively thin, a series of parallel grooves provided along the sides of said body portion, a lange-extendingrearward- 1,9o7,ooc

1y of said body portion and positioned intermediate the side edges thereof, the upper and'lower edges of said ange terminat-v ing inwardly of ythe ends of said body portion to facllitate the installation and removal of said grid, and a hook provided at l the rear edge of said flange for engaging fixed securing means to retain said grid in proper position.

23. A grid for an air-cooled furnace wall comprising a body portion having a surface exposed to the heat of the furnace, the lower end of said body portion being relatively thick to provide an extended base, aseries of parallel grooves provided at the sides of said body portion, `and a flange extending rearwardly lof said body portion intermediate the side edges thereof, said flange constituting means or securing said body portion to a supporting structure. 24. A grid for an air-cooled furnace wall kcomprising a body portion having a surface exposed to the heat of the furnace, said body portion being relatively thin over the major portion of its length but being extended rearwardly at the bottom to form a substantial base, afflange` extendingv rearwardly,

from said body portion intermediate the side edges thereof, and means on said ange providing for interlocking engagement thereof with a'supporting structure, said body portion having at its longitudinal ed es a sevai sesv

ries of grooves forming air channe s terminating at opposite ends in the front and rear faces respectively. i

25. A ram box cap extension of substantially inverted U'shaped form; the upper y portion of said cap extension being provided with an air chamber and a reduced portionextending tothe rear thereof, a hook provided on said reduced portion for engaging I fixed securing means to retain said cap extension 1n properl pds1t1on,.an enlargedalr' ,passage provided at each side 'of saidf ca.

extension and'leading toisaid chamberyan aseries of air as'sages deading from osaid chamber to the ontprsurface of said cap extension, said parts being so arranged that air may, enter said chamber through said first-mentioned passages, and be discharged through said 1astmentionedpassa es. L fg 26. A ram box cap extension o 'substantially inverted Ufsh'aped form, ,the u perY portion of said capk being providedcwit an air chamber, the upper wall Iof said chamber,l forming the upper surface of said extension, and the lower wall of said chamber converging with said upper wall toward the inner end of said extension, said extension 'having at a side thereofan air passage communicating with said chamber and having a series of .air passages extending from said ,chamber to `the inner surface of said extension.

27. An air box for st okerv furnaces' com- 

